新型铰缝设计及增强技术研究

2020-10-21 06:09:53卞华伟
河南科技 2020年2期

卞华伟

摘 要:近年来,随着我国城市化进程的不断推进,桥梁建设行业得到了飞速发展。铰接空心板梁桥具有结构简单、建筑高度小、成本低、自重小等优势,它可以进行批量工厂化预制,施工方便,在中小跨径桥梁中得到了广泛应用。然而,随着交通量的日益增大,在多种因素综合影响下,装配式空心板梁桥的病害问题日益凸显。为了克服传统铰缝无法有效振捣及抗裂性能差等缺陷,本文提出一种新型的铰缝形式,并探讨了相关铰缝增强技术。

关键词:空心板桥;铰缝筋;增强技术

中图分类号:U442.5文献标识码:A文章编号:1003-5168(2020)02-0088-03

Abstract: In recent years, with the continuous advancement of urbanization in China, the bridge construction industry has developed rapidly. The articulated hollow slab bridge has the advantages of simple structure, small building height, low cost, and low self-weight,which can be prefabricated in batches and convenient to construct,and is widely used in small and medium span bridges. However, with the increasing traffic volume, under the comprehensive influence of various factors, the disease problem of fabricated hollow slab bridges has become increasingly prominent.In order to overcome the defects that traditional hinge joints could not be effectively vibrated and have poor crack resistance, this paper proposed a new type of hinge joint and discussed related hinge joint reinforcement technologies.

Keywords: hollow slab bridge;hinge joint;reinforcement technology

装配式简支板空心板梁桥具有构造简单、可工厂大批量生产、自重小、便于运输和安装等优势[1-3],和相同跨径的T形梁相比,其建筑高度小,现场湿作业少,所以其在中小跨径桥梁中应用广泛。钢筋混凝土空心板梁跨径一般为6~10m,而预应力混凝土空心板梁跨径一般为10~20m。早期设计的该类型桥中,连接形式以小企口缝为主,一些设计人员认为,这种桥梁结构形式简单,理论基础和实践经验成熟,但是在进行荷载设计时,荷载估算存在较大偏差。面对长期交变荷载和超重荷载,结构的振动特性、动力性能以及疲劳特性等缺乏可靠的理论支持和工程实践。在这种情况下,空心板梁桥经过若干年的使用,易出现铰缝断裂,而桥面板处于“单板受力”状态。

1 空心板桥铰缝发展历程

对于装配式钢筋混凝土空心板梁桥来说,其荷载的横向分布必须依靠横向传力构件来实现,一般称横向传力构件为铰缝。……

登录APP查看全文